Question

In Drosophila, nondisjunction during meiosis in the parent can result in flies with abnormal numbers of sex chromosomes. Flies with a single X and no Y are male, and those with XXY are female. Which of the following events could not give rise to a male with a single X in Drosophila? Nondisjunction at meiosis II in the female parent Nondisjunction at meiosis I in the male parent Nondisjunction at meiosis I in the female parent All of these CAN give rise to a male with a single X in Drosophila Nondisjunction at meiosis II in the male parent

Answer 1

Option C is correct, non disjunction at meiosis 1 of female parent.

Because if non disjunction occurs at meiosis 1 the XX chromosome moves collectively in offsprings thatswhy it do not give rise to male but if non disjunction occurs at meosis II then one offspring would not be male and others can be male means it is not compulsory that it will not give rise to male.

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